Gorm 使用 Serializer 标签实现json序列化读写入库会报错

# 我的问题是：

type Content struct {
    Id            uint64    `gorm:"primaryKey;column:id;type:bigint unsigned;not null"`
    SubType       int                           `gorm:"column:sub_type;type:int unsigned;not null;default:0"`
    ExtInfo       ExtInfo `gorm:"column:ext_info;serializer:json;default:'{}'" json:"ext_info"`
}

type ExtInfo struct {
    Special string `json:"special"`
}

如上一个结构体，入库时，ext_info 字段正常入库：

{"special":"cure"}

读数据时期望能够正常序列化为 ExtInfo 结构体。

目前问题是读数据直接报错：

sql: converting argument $3 type: unsupported type db.ExtInfo, a struct

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